0 7 0 0 5

www.twovolt.com www.youtube.com/thetwovolt Author Rajkumar Sharma ©www.koteq.com

www.twovolt.com

Optically Isolated LPT Breakout Board for CNC & Routers

Optically isolated parallel port break out board designed for Hobby CNC, Routers and Motion controller,

This Board is an easy solution to drive stepper Motor driver through PC parallel port, The Board is

compatible with various CNC software specially made for LPT port data output. The board has been

tested with MACH3 CNC software. All outputs are optically isolated and inverse, all inputs are optical

isolated and can be used as emergency switch, limit switch, home switch and feedbacks. The Opt

coupler and inverter require power supply at both PC side and output side. USB connector and CN5

Screw terminal provided for PC side power supply input and CN4 for output side power supply 7 to 36V

DC.

The board has 12 output pins that can control various devices such as stepping motor drivers, Plasma

Torch, Pump for coolant, spindle, 5 Input pins are provided for limit or home switches, feedbacks,

Emergency switch. All inputs has 470E for TTL Voltage input required driving the inputs.

Note: Change the value of R10, R12, R13, R15, and R16 to 2K2 Ohms for 24V signal input.

Features

· Supply 7V to 36V DC output side of opt-coupler

· 5V DC for PC side

· 25 D SUB Male Connecter for PC LPT Port Interface

· High Speed Opto-coupler s 6N137 on all outputs

· PC817 Opto-coupler for Inputs and Output Controls

· On Board USB Connector for Supply from PC or other source

· All Outputs are buffered and optically isolated

· All inputs are optically isolated

· Screw Terminals for all outputs and inputs

· On Board L317 Regulator for 5V DC

· Heat sink for regulator Connections CN5, CN6: 5V DC Supply input for PC side of isolation CN4: 7 to 36V DC Input for output side of opto-coupler CN2: Optically isolated Outputs CN3: Inputs

SR QNTY. REF. DESC.

1 1 CN1 DB-25 MALE

2 1 CN2 13 PIN SCREW TERMINALS

3 1 CN3 6 PIN SCREW TERMINALS

4 2 CN4,CN5 2 PIN SCREW TERMINALS

5 1 CN6 USB CONNECTOR

6 3 C1,C2,C5 0.1uF

7 2 C3,C4 10uF/63V

8 2 RN1,RN4 4.7K 9 PIN RESISTOR PACK

9 1 RN2 4.7K 10 PIN RESISTOR PACK

10 1 RN3 4.7K 5PIN RESISTOR PACK

11 17 R1,R2,R3,R4,R5,R6,R7,R8,R9,R10,R11,R12,R13,R14,R15,R16,R17 470E

12 1 R18 220E

13 1 R19 680E

14 8 U1,U5,U8,U9,U11,U14,U17,U19 6N137

15 2 U2,U10 74HC14

16 9 U3,U4,U6,U7,U12,U13,U15,U16,U18 PC817

17 1 U20 LM317 TO220

BOM

0 7 0 0 5

www.twovolt.com www.youtube.com/thetwovolt Author Rajkumar Sharma ©www.koteq.com

www.twovolt.com

Optically Isolated Parallel Port Breakout Board for CNC, Routers

0 7 0 0 5

www.twovolt.com www.youtube.com/thetwovolt Author Rajkumar Sharma ©www.koteq.com

www.twovolt.com

Optically Isolated LPT Breakout Board for CNC, Routers

0 7 0 0 5

www.twovolt.com www.youtube.com/thetwovolt Author Rajkumar Sharma ©www.koteq.com

www.twovolt.com

Optically Isolated LPT Breakout Board for CNC, Routers

Enable,Control

Enable,Control

Enable,Control

Enable,Control

Step,Dir.,Enable,Control

Step,Dir.,Enable,Control

Step,Dir.,Enable,Control

Step,Dir.,Enable,Control

Step,Dir.,Enable,Control

Step,Dir.,Enable,Control

Step,Dir.,Enable,Control

Step,Dir.,Enable,Control

GND Output Side

Input , Home, Limits

GND Output Side

GND Output Side

+ Supply Output side 7-36V

GND PC Side

+ Supply PC Side 5V

PC Parallel Port

USB for Supply input

Input , Home, Limits

Input , Home, Limits

Input , Home, Limits

Input , Home, Limits